/Engine/Source/Runtime/AIModule/Classes/Perception/PawnSensingComponent.h
Returns true if we should check whether the given Pawn is visible (because we can see things, the Pawn is not hidden, and if the Pawn is a player and we only see players)
virtual bool ShouldCheckVisibilityOf ( [APawn](API\Runtime\Engine\GameFramework\APawn) * Pawn ) const